Drain the tank: Flush the toilet to empty as much water as possible, then use a sponge or towel to soak up the remainder. Remove the old fill valve: Unscrew the water supply line and loosen the ...

Before removing the old fill valve, you'll want to purchase a replacement part that matches. If you know the model number of toilet you have, you can potentially find a replacement that way.

Use an old toothbrush to brush off the buildup ... If these tips don't fix the issue, you may simply need to replace the toilet fill valve. Read the original article on House Digest.